cros: Reset local object path when fingerprint enrollment is done.

Fingerprint enrollment session is ended automatically when it is complete.
Local object path needs to be reset for this case.

Bug: 834448
Change-Id: Ieedf5f2f9fbf6ef7b3519414ef792b5cb54ba163
Reviewed-on: https://chromium-review.googlesource.com/1162906Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Xiaoyin Hu <xiaoyinh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580907}

chromeos/dbus/biod/biod_client.cc

@@ -347,6 +347,10 @@ class BiodClientImpl : public BiodClient {
     int percent_complete =
         protobuf.has_percent_complete() ? protobuf.percent_complete() : -1;
 
+    // Enroll session is ended automatically when enrollment is done.
+    if (protobuf.done())
+      current_enroll_session_path_.reset();
+
     for (auto& observer : observers_) {
       observer.BiodEnrollScanDoneReceived(protobuf.scan_result(),
                                           protobuf.done(), percent_complete);